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 Apr 13 answered How to find Tangential/Radial/Angular Velocity for motion in any curve? Apr 13 answered Equilibrium of a Solid Body Apr 12 answered How does distance affect force? Apr 12 comment Finding the force exerted by a mass at different contact points You know gravity always acts through the center of mass. That is how you find the distribution. See my answer. Apr 12 answered Finding the force exerted by a mass at different contact points Apr 12 comment Finding the force exerted by a mass at different contact points Is the box being lifted slowly and is in static equilibrium the entire time, or is it thrown up fast and its vertical acceleration needs to be accounted for? Apr 12 revised Does inelastic collision say the ball bounces back to you when thrown at an angle on ground? deleted 6 characters in body Apr 12 comment Does inelastic collision say the ball bounces back to you when thrown at an angle on ground? Treat the $\leftarrow$ as an assignment. It says assign $\dot{x}+\delta$ to $\dot{x}$. As far as the dots, they are just notation. You don't have to actually take a derivative. In code $\dot{x}_1$ would be a single variable xp_1. And $\Delta \dot{x}_1$ would be dxp_1 for example. You would need to code in 3×3 matrix to 3×1 vector multiplication thought. Apr 12 comment Does inelastic collision say the ball bounces back to you when thrown at an angle on ground? ok, things are easier in 2D. Follow the procedure in my answer. If you want friction it builds upon this. Apr 12 answered Does inelastic collision say the ball bounces back to you when thrown at an angle on ground? Apr 12 comment Does inelastic collision say the ball bounces back to you when thrown at an angle on ground? Is this a 2D or a 3D simulation? Apr 11 answered Acceleration of moving reference frame Apr 11 comment Acceleration of moving reference frame So it measures changes in linear momentum in an inertial frame. Apr 11 answered The two causes for the factor 2 in Coriolis effect Apr 11 comment How do I derive the formula of coefficient of restitution? You can derive it because it is an empirical quantity. You can only define it. Apr 11 answered What is the moment of inertia really? Apr 11 comment What is the moment of inertia really? Rotation about a fixed axis yields a single MMOI. But rotation in general (once you move the axis around) involves 6 quantities that are related to 3 principal quantities and 3 orientation angles. Apr 11 comment Why did Einstein took speed of light unit or constant in his equation of relativity? Maxwell's equations gave Einstein a clue about $c$ as a limit. Apr 11 comment Proof derivative of a vector following precession motion The bottom angle is not a metric (you cannot measure with it) because a full circle is not 360°. It is $2\pi\,\sin \alpha$. This is because $${\rm d}\theta_{bot} = {\rm d}\theta_{top} \sin \alpha$$ You can confirm this because it lies on the surface of a cone and not on a plane. Apr 11 comment Proof derivative of a vector following precession motion No it does not.